{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2026-05-26T00:16:20.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2026-05-26T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":1130,"title":"Challenging perms function!","description":"This problem is highly related with \u003chttp://www.mathworks.com/matlabcentral/cody/problems/1127-decrypt-a-secret-message Problem 1127\u003e.\r\n\r\nIn oder to encrypt the word 'go' using phone keyboard, we need to do these;\r\n\r\n- first find the digits that includes the letters in word. For example letter 'g' takes place on key 4. Letter 'o' is on key 6. So first number is 46.\r\n\r\n- create all string permutations using the letters on keys (4 and 6). There are 'ghi' letters on key 4 and 'mno' letters on key 6. All two letter permutation list is {'gm';'gn';'go';'hm';'hn';'ho';'im';'in';'io'}. In this list third one is 'go'. So second number must be 3.\r\n\r\nIf input is 'go'; output must be [46 3].\r\n\r\nWhat about 'hydroglycerin'? it is 1679616 th word on the permutation list constructed using keys 4937645923746.\r\n\r\nIf input is 'hydroglycerin'; output must be [4937645923746 1679616].\r\n\r\nGiven a string, return the keys on phone-keyboard and the order of this string in permutation list!","description_html":"\u003cp\u003eThis problem is highly related with \u003ca href=\"http://www.mathworks.com/matlabcentral/cody/problems/1127-decrypt-a-secret-message\"\u003eProblem 1127\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eIn oder to encrypt the word 'go' using phone keyboard, we need to do these;\u003c/p\u003e\u003cp\u003e- first find the digits that includes the letters in word. For example letter 'g' takes place on key 4. Letter 'o' is on key 6. So first number is 46.\u003c/p\u003e\u003cp\u003e- create all string permutations using the letters on keys (4 and 6). There are 'ghi' letters on key 4 and 'mno' letters on key 6. All two letter permutation list is {'gm';'gn';'go';'hm';'hn';'ho';'im';'in';'io'}. In this list third one is 'go'. So second number must be 3.\u003c/p\u003e\u003cp\u003eIf input is 'go'; output must be [46 3].\u003c/p\u003e\u003cp\u003eWhat about 'hydroglycerin'? it is 1679616 th word on the permutation list constructed using keys 4937645923746.\u003c/p\u003e\u003cp\u003eIf input is 'hydroglycerin'; output must be [4937645923746 1679616].\u003c/p\u003e\u003cp\u003eGiven a string, return the keys on phone-keyboard and the order of this string in permutation list!\u003c/p\u003e","function_template":"function y = encryptt(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 'm';\r\ny_correct = [6 1];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'go';\r\ny_correct = [46 3];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'cody';\r\ny_correct = [2639 99];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'hydroglycerin';\r\ny_correct = [4937645923746 2616254];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'antidisestablishmentarianism';\r\ny_correct = [2684347378225474636827426476 13474859120710];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n\r\n%% \r\nx = 'there must be an efficient technique';\r\ny_correct = [84373 56 6878 22 23 5 26 2 333424368 13108 832464783 5378];\r\nassert(isequal(encryptt(x),y_correct))","published":true,"deleted":false,"likes_count":0,"comments_count":11,"created_by":8703,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":"2012-12-21T12:16:02.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2012-12-21T07:23:02.000Z","updated_at":"2026-05-26T15:30:16.000Z","published_at":"2012-12-21T12:16:02.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem is highly related with\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/1127-decrypt-a-secret-message\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eProblem 1127\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn oder to encrypt the word 'go' using phone keyboard, we need to do these;\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e- first find the digits that includes the letters in word. For example letter 'g' takes place on key 4. Letter 'o' is on key 6. So first number is 46.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e- create all string permutations using the letters on keys (4 and 6). There are 'ghi' letters on key 4 and 'mno' letters on key 6. All two letter permutation list is {'gm';'gn';'go';'hm';'hn';'ho';'im';'in';'io'}. In this list third one is 'go'. So second number must be 3.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf input is 'go'; output must be [46 3].\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWhat about 'hydroglycerin'? it is 1679616 th word on the permutation list constructed using keys 4937645923746.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf input is 'hydroglycerin'; output must be [4937645923746 1679616].\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a string, return the keys on phone-keyboard and the order of this string in permutation list!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"problems":[{"id":1130,"title":"Challenging perms function!","description":"This problem is highly related with \u003chttp://www.mathworks.com/matlabcentral/cody/problems/1127-decrypt-a-secret-message Problem 1127\u003e.\r\n\r\nIn oder to encrypt the word 'go' using phone keyboard, we need to do these;\r\n\r\n- first find the digits that includes the letters in word. For example letter 'g' takes place on key 4. Letter 'o' is on key 6. So first number is 46.\r\n\r\n- create all string permutations using the letters on keys (4 and 6). There are 'ghi' letters on key 4 and 'mno' letters on key 6. All two letter permutation list is {'gm';'gn';'go';'hm';'hn';'ho';'im';'in';'io'}. In this list third one is 'go'. So second number must be 3.\r\n\r\nIf input is 'go'; output must be [46 3].\r\n\r\nWhat about 'hydroglycerin'? it is 1679616 th word on the permutation list constructed using keys 4937645923746.\r\n\r\nIf input is 'hydroglycerin'; output must be [4937645923746 1679616].\r\n\r\nGiven a string, return the keys on phone-keyboard and the order of this string in permutation list!","description_html":"\u003cp\u003eThis problem is highly related with \u003ca href=\"http://www.mathworks.com/matlabcentral/cody/problems/1127-decrypt-a-secret-message\"\u003eProblem 1127\u003c/a\u003e.\u003c/p\u003e\u003cp\u003eIn oder to encrypt the word 'go' using phone keyboard, we need to do these;\u003c/p\u003e\u003cp\u003e- first find the digits that includes the letters in word. For example letter 'g' takes place on key 4. Letter 'o' is on key 6. So first number is 46.\u003c/p\u003e\u003cp\u003e- create all string permutations using the letters on keys (4 and 6). There are 'ghi' letters on key 4 and 'mno' letters on key 6. All two letter permutation list is {'gm';'gn';'go';'hm';'hn';'ho';'im';'in';'io'}. In this list third one is 'go'. So second number must be 3.\u003c/p\u003e\u003cp\u003eIf input is 'go'; output must be [46 3].\u003c/p\u003e\u003cp\u003eWhat about 'hydroglycerin'? it is 1679616 th word on the permutation list constructed using keys 4937645923746.\u003c/p\u003e\u003cp\u003eIf input is 'hydroglycerin'; output must be [4937645923746 1679616].\u003c/p\u003e\u003cp\u003eGiven a string, return the keys on phone-keyboard and the order of this string in permutation list!\u003c/p\u003e","function_template":"function y = encryptt(x)\r\n  y = x;\r\nend","test_suite":"%%\r\nx = 'm';\r\ny_correct = [6 1];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'go';\r\ny_correct = [46 3];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'cody';\r\ny_correct = [2639 99];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'hydroglycerin';\r\ny_correct = [4937645923746 2616254];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n%%\r\nx = 'antidisestablishmentarianism';\r\ny_correct = [2684347378225474636827426476 13474859120710];\r\nassert(isequal(encryptt(x),y_correct))\r\n\r\n\r\n%% \r\nx = 'there must be an efficient technique';\r\ny_correct = [84373 56 6878 22 23 5 26 2 333424368 13108 832464783 5378];\r\nassert(isequal(encryptt(x),y_correct))","published":true,"deleted":false,"likes_count":0,"comments_count":11,"created_by":8703,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":11,"test_suite_updated_at":"2012-12-21T12:16:02.000Z","rescore_all_solutions":false,"group_id":1,"created_at":"2012-12-21T07:23:02.000Z","updated_at":"2026-05-26T15:30:16.000Z","published_at":"2012-12-21T12:16:02.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThis problem is highly related with\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"http://www.mathworks.com/matlabcentral/cody/problems/1127-decrypt-a-secret-message\\\"\u003e\u003cw:r\u003e\u003cw:t\u003eProblem 1127\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIn oder to encrypt the word 'go' using phone keyboard, we need to do these;\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e- first find the digits that includes the letters in word. For example letter 'g' takes place on key 4. Letter 'o' is on key 6. So first number is 46.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e- create all string permutations using the letters on keys (4 and 6). There are 'ghi' letters on key 4 and 'mno' letters on key 6. All two letter permutation list is {'gm';'gn';'go';'hm';'hn';'ho';'im';'in';'io'}. In this list third one is 'go'. So second number must be 3.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf input is 'go'; output must be [46 3].\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWhat about 'hydroglycerin'? it is 1679616 th word on the permutation list constructed using keys 4937645923746.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIf input is 'hydroglycerin'; output must be [4937645923746 1679616].\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGiven a string, return the keys on phone-keyboard and the order of this string in permutation list!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"errors":[],"facets":[[],[{"value":"medium","count":1,"selected":false}]],"term":"tag:\"phone keyword\"","page":1,"per_page":50,"sort":"map(difficulty_value,0,0,999) asc"}}